Three ways to abstract a class

There are three kinds of methods in the abstract class.

1. Abstract methods

2. Common methods

3. Virtual methods

1  Abstract classClass12     {3         //Abstract methods in abstract class Class14          Public Abstract voidstr1 ();5         //common methods in abstract class Class16          Public voidstr2 ()7         {8Console.WriteLine ("Common Methods");9         }Ten         //the virtual method inside the abstract class Class1 One          Public Virtual voidSTR3 () A         { -Console.WriteLine ("This is a virtual method"); -         } the  -}

So, what is the difference between the three methods?

1 classClass2:class12     {3         //overloads of the abstract method str14          Public Override voidstr1 ()5         {6Console.WriteLine ("overloading of abstract methods");7         }8         //inheritance of virtual method Str39          Public Override voidSTR3 ()Ten         { One             Base. STR3 (); AConsole.WriteLine ("I rewrote the Str3 method"); -         } -         //inheritance of common method str2 the          Public voidstr () -         { -             Base. STR2 (); -         } +}

Console:

1   class Program2     {3         Static voidMain (string[] args)4         {5Class2 JJ =NewClass2 ();6 jj.str1 ();7 JJ.STR3 ();8 jj.str ();9 Console.readkey ();Ten         } One  A}

Operation Result:

Summarize:

1. Abstract methods

Abstract methods cannot have method bodies, which can be overloaded after they are inherited. and must be inherited.

2. Common methods

Normal methods can be inherited or not inherited. The difference from virtual methods is that the normal method cannot be overloaded, that is, the method body cannot be changed.

3. Virtual methods

Virtual methods can be inherited or not inherited. The difference from the normal method is that the virtual method inherits the Override keyword and allows overloading, that is, modifying the method body.

The last sentence: please stick to your dream.

Three ways to abstract a class